exterior angle

noun

Geometry.

an angle formed outside parallel lines by a third line that intersects them.
an angle formed outside a polygon by one side and an extension of an adjacent side; the supplement of an interior angle of the polygon.

exterior angle

noun

an angle of a polygon contained between one side extended and the adjacent side
any of the four angles made by a transversal that are outside the region between the two intersected lines

exterior angle

The angle formed between a side of a polygon and an extended adjacent side.
Compare interior angle

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Word History and Origins

Origin of exterior angle¹

First recorded in 1885–90

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Example Sentences

Examples have not been reviewed.

In an effort to render the sculptural qualities of his design more dramatic, Saarinen made the bedroom windows unusually narrow, so that they disappeared from view from certain exterior angles.

From

Five cameras will cover each exterior angle of the 16th president’s tomb, as well as the parking lot at Oak Ridge Cemetery.

From

The proposition relating to the exterior angle was recognized by Pappus of Alexandria.

From

For the lines will form a triangle, and one of the alternate angles will be an exterior angle to the triangle, the other interior and opposite to it.

From

ABC is an exterior angle or angle of the polygon.

From

exterior exteriority

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